Try these things:
1. Go to Start menu > Programs > LimeWire > Uninstall.
__ If that works then reinstall LW again.
2. Download the OFFLINE version & install. If it won't let you, then try step 3.
3.
Errors due to mistakenly uninstalling LW using Add/Remove control panel - what to try now. Read from here onward!
This is not the appropriate section for your last question by the way. lol